Chapter 15.4, Problem 2CC

Summary Introduction

To determine: In which parent the non-disjunction of chromosome 9 has occurred based on the information that the father is of blood type AB and mother is of blood type O, and their child is of the blood type A with trisomy in chromosome 9

Concept introduction:

The term non-disjunction means that the chromosomes that appeared together in the cell did not separate during the gamete formation and were carried together into the gamete formed. The non-disjunction of the paired chromosome leads to the chromosomal aberration called trisomy in the offspring.